- A minimum of 1 and a maximum of 4 prior systemic therapy regimens for recurrent/metastatic disease; the last dose of systemic therapy (include tyrosine kinase inhibitors) must have been given at least 4 weeks prior to initiation of therapy; patients receiving carmustine (BCNU) or mitomycin C must have received their last dose of such therapy at least 6 weeks prior to initiation of therapy